Insulation block and electrical construction for the terminals of electric ranges



June 3 1924. 1,496,552

R. H. M lNNES INSULATIONBLOCK AND ELECTRICAL CONSTRUCTION FOR THETERMINALS OF ELECTRIC RANGES Filed May 24, 1923 ZHYZ Patented June 3,1924.

UNITED STATES 1,496,552 PATENT OFFICE.

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COMPANY, LIMITED, 01 HAMILTON, ONTARIO, CANADA.

INSULATION BLocx mm ELECTRIGAL cons'rnuc'rron ron, THE TERMINALS ornnncmrc muons.

',App1icatlon filed Kay 24, 1923. Serial No. 641,265.

To all whom it may concern:

Be it known that Ronra'r H. MAcINNns, a subject of the King of GreatBritain, residing at Hamilton, in the county of Ventworth and Provinceof Ontario, Canada, has

invented certain new and useful Improvements in an Insulation Block andElectrical Construction for the Terminals of Electric Ran es, of whichthe following is 'a SPQCl': fication.

Mv invention relates to improvements in insu ation blocks and electricalconstructions for the terminals of electric ranges, and moreparticularly to the. connections of 1 the heating coils or resistencewiring to the lead wires connecting with the source of electricity, andconsists essentially of an insulation block extending inwardly to theelectric burner from the outside of the oven and pro- 0 vided with aplurality of holes through which extend the ends of the resistence wiresto the outside, and a terminal insulation plate secured to the outsideof the oven and provided with terminals to which are attached 2 the endsof the resistence wires and the ends of the leads, said terminal platebeing pro vided with a slot and bushing extending through the outer ovenwall and through which the leads are carried to the intervening spacebetween the inner and outer oven walls. 1

The object of the invention is to provide a device of the classspecified which will afford the maximum accessibility and facilities forrepairs to the terminals.

A further object is to provide such a device. which will be simple,durable, efiicient and inexpensive to manufacture.

A still further object is to provide means forcarrying the lead wiresthrough the space between the outer and inner oven walls and at the sametime exposing the terminals thereof for repair.

These, together with other objects, may be attained by the construction,combination and arrangement of the parts as will be hereinafter morefully described, illustrated in the accompanying drawing, andpointed outin the claims hereunto appended.

Referring to the drawing:

Figure 1 is a top sectional view of a ortion of the oven showing theinsulation b ock and a portion of the terminal plate;

Figure 2 is a sectional side elevation of a portion of the oven showingthe insulation lock and terminal plate also in section;

Figure 3 is a front elevation of a portion of the oven showing theterminal plate and insulation block;

Fi re 4 is a front elevation of a portion of t e oven showing theterminal cover plate; and,

Figure 5 is an enlarged sectional side elevation of theinsulation blockand terminal plate.

Similar reference characters refer to similar parts throughout theseveral views.

The oven is constituted, as usual, of double walls A and double floorI), with an intervening space between the walls which is packed withmineral wool, asbestos or other heat insulating material adapted toconfine the heat within the oven.

" The inner or upper part of the door B is suitably recessed to form awell B within which is contained the electric burner C consisting of aporcelain plate, for example, in grooves in which are woven theresistance wires or heating coils 4 suitable for three differenttemperatures of heat.

A block D consisting of porcelain, for example, is provided, which initself is not new in construction. This block which is provided with anenlarged rectangular head D is horizontally located between a portion ofthe floorin'g of the oven adjacent the burner C and extending throughthe walls of the oven to the exterior thereof.

To the exterior of the outer oven wall A is secured a terminalinsulation plate E of porcelain, for example, provided with terminalrecesses 5 in which are secured preferably metallic plates 6 by means ofthe bolts 7. These plates 6 extend upwardly in the recesses 5 and aretapped to receive terminal bolts 8. On the inner side of the lower endart of the terminal plate E is formed a ongitudinal bushing 9 throughwhich is provided a slot 10. This bushing extends through acorresponding slot in the outer oven wall and insulates the edgesthereof. The lead wires 11 are conveyed between the outer and inner ovenwalls A and pass to the interior thereof through the slot 10 in theterminal plate E thence upwardly to the terminalbolts 8, their endsbeing formed into terminals and secured to the said bolts.

The resistance wires 4 are conveyed MACINNES, OF HAMILTON, ONTARIO,CANADA, ASSIGNOR T0 D. MOORE througli holes 12 in the insulation blockD,

their ends being formed into terminals and provided, and by way ofexample I have illustrated a sheet metal detachable cover I! which maybe. secured to the oven wall by the provision of lugs 13 adapted toengage lips 14 formed in the wall A, and the opposite side of the covermay be secured by a swivel fastener 15. v

There has thus been provided a simple and efficient device of the classdescribed and for the purpose specified Having now fully described myinvention what I claim and desire to secure by Letters Patent, is 1.- Ina device of the class described, the combination with an electric ovenincluding walls, and resistance wiresinounted within the oven, of ablock of insulating material extending through one wall of the oven fromthe outside to the inside and having a plurality of holes extendingtherethrough, a terminal plate of insulating v material secured to theoutside of said wall adjacent said block and having a slot therein,terminal fasteners secured to said plate, the free ends of saidresistance; wires passing through the holes in said block and secured tosaid terminal fasteners, a bushing formed around the slot in saidterminal plate on the inner side thereof and extending through the ovenWall to the inside, and lead Wires passed through said slot and securedat their free ends teners. a a

2. In a device of the classdescribed,;the combination with an electricaloven includto said terminal fasv ing double walls filled with heatinsulating material and resistance Wires mounted within the oven, of ablock of insulating material extending through one double Wall of theoven from the outside to the inside and having a plurality of holesextending therethrough, a plate of insulating material secured to theoutside of the outer wall adjacent said block and having a slot therein,terminal fasteners secured to said plate, the free ends of saidresistance wires passing through the holes in said block and secured tosaid terminal fasteners, a bushing formed around the slot in saidterminal plate on the inner side thereof and extending through theouterwall of the oven, and

lead Wires carried between the doublewalls,

passed through said slot,'and secured at their free ends to saidterminal fasteners. V

3. In a device'of the class described, the combination with an electricoven including walls, and resistance wires mounted within the oven, of ablock of insulating material extending through one wall of the oven fromthe outside to the inside and having a plurality of holes extendingtherethrough, a terminal plate of insulating material sea cured totheoutside of said Wall adjacent,

terminal fasteners secured tosaid plate, the free ends of saidresistance said block,

wires passing through the holes in said block and secured to saidterminal fasteners, and lead wires secured at their free ends to saidterminal fasteners.

In testimony whereof I have atiixed my signature. I Y

Y Y ROBERT H. MACINNES. lVitnesses Q H. G. HENDRY,

V, D. EARLE.

